Author: Bruce Moreland
Date: 09:31:29 12/19/97
I think this problem may be tougher than several of the Nolot problems: 5b2/2R1Nq1k/6p1/1P1Pp1Bp/4b3/7P/6P1/6K1 b - - 0 1 The key is Bxg2. This is from Abramovich vs Benjamin, 1984, as published on page 55 of Chess Life and Review, Dec '97. The solution given there is: 1. ... Bxg2 2. Kxg2 e4 3. d6 Qf3+ 4. Kh2 Bg7 5. Nc6 Qe2+ 6. Kh1 e3 7. Re7 Qd1+ 8. Kg2 Qd5+ 9. Kf1 Qxb5+ 10. Ke1 Qxc6 11. d7 Qc1+ 0-1 It took my program 20 plies to find the key (ten hours and six minutes on a PII/300). My PV was 1. ... Bxg2 2. Kxg2 e4 3. b6 Bg7 4. Nc6 Qf3+ 5. Kh2 Qf2+ 6. Kh1 Qxb6 7. Bf4 Qb1+ 8. Kh2 Qc2+ 9. Kg3 e3 10. Bxe3 h4+ 11. Kf3 Qf5+ 12. Ke2 Qxd5 13. Kf2 Qd6 14. Rc8 Qg3+ 15. Ke2 I haven't tried to see if this makes any sense. Perhaps it would take other programs less time, since Bxg2 only scored 0.2 points higher than the move that had been preferred previously (Kh8), or perhaps someone else just has better extensions and eval than I do for this particular problem. I would like to hear other results, if someone wants to try this problem. bruce
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